The post gives an example - overloading a method based on the type parameter (e.g separate overloads for Option<Integer> and Option<Double>). This is why Java's

The post gives an example - overloading a method based on the type parameter (e.g separate overloads for Option<Integer> and Option<Double>). This is why Java's generic erasure is more of a problem than Haskell's type erasure: Java erases generic parameters at compile time, whereas Haskell retains type information for long enough to use it when linking modules.